Margined White (Pieris marginalis)
Wingspan: 38 to 57 mm
Male: white above and below, sometimes with yellowish tint. Veins usually lined with gray to greenish-gray, especially on VHW. Spring form has more gray on dorsal wings.
Female: slightly heavier gray markings.
Egg: yellowish white.
Larva: bright green covered with tiny white and dark green speckles and faint stripes.
Pupa: greenish yellow to tan.
Cabbage White (Pieris rapae) almost always has one or two black spots on DFW and black FW apex, and lacks the dark wing veins on the VHW. Some forms of Margined White lack strongly-marked VHW veins and may have faint black DFW spots similar to Cabbage Whites. Margined Whites tend to be more common in woodlands and forest edges, while Cabbage Whites are more common in disturbed habitats.
Habitat & Biology
Habitat: woodland edges and clearings, riparian areas and forest road corridors.
Overwintering stage: pupa.
Larval host: native crucifers, including rockcress (Arabis spp.) and bittercress (Cardamine spp.).
Adult food source: many flowers, including mustards, dandelions, asters, daisies, cinquefoils, and salmonberry.
|Flowers of plant (likely Cardamine angulata) that eggs were found on.|
|Leaf of plant (likely Cardamine angulata) that eggs were found on|
|Margined White (Pieris marginalis) egg on Angled Bittercress (Cardamine angulata)|
|Newly-hatched larva (L1) of Margined White (Pieris marginalis)|
|Late L1 (first instar) larva of Margined White|
|Freshly molted L2 (second instar) larva of Margined White|
|Late L2 (second instar) larva of Margined White|
|Freshly molted L3 (third instar) larva of Margined White|
|L4 (fourth instar) larva of Margined White (head is facing down)|
|L4 (fourth instar) larva of Margined White (head is on left)|
|L5 (fifth instar) larva of Margined White (head is on right)|
|Newly-formed pupa of Margined White|
|Pupa (4 days old) of Margined White - note the small white patch of the wing forming|
|Pupa (4 days old) of Margined White|
|Pupa (8 days old, 3 days before emergence) of Margined White|
|Empty pupa after emergence of adult Margined White|
|Newly-emerged male Margined White|